giant hogweed - invasive

Cow parsnip (Heracleum lanatum), which rarely exceeds 6 ft and has a flat flower cluster 1 ft wide and palmately lobed leaves. Hairs on the underside of its leaf are soft, wavy, shiny, and about 1 mm long. Angelica (Angelica atropurpurea), which has a smooth, purple stem, rarely exceeds 8 ft tall, and has round, white flowers. Height: 8–15 ft when flowering. Leaves: Large, compound, deeply incised, and 3–5 ft wide. Hairs on the underside are stiff, dense, and stubby but only about 0.25 mm long. Petioles have short, coarse white hairs at the base. Flower head: Flat topped and up to 2.5 ft across. • Ravines, roadside ditches, and riparian areas • Residential properties and vacant lots • Wooded or open-space areas between residential communities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direct contact with hogweed’s leaves or stems can blister the skin. Glucoside phototoxins in the plant’s clear, watery sap react with sunlight to cause the painful blisters. GIANT HOGWEED The preferred method of control is integrated pest management (IPM). Site-specific control methods need to match local situations. Denial of seed production, with appropriate site rehabilitation, for 4 to 5 years usually eradicates limited local populations. Habitat Habitat Morphology Morphology Commonly Mistaken for... Commonly Mistaken for... Public Health Hazard Public Health Hazard U.S. Department of Agriculture • Animal and Plant Health Inspection Service Program Aid No. 1744 June 2003 Photo credits: USDA Forest Service employee David Powell took the shot of cow parsnip. The remaining images were taken by APHIS photographers from North Carolina. All photos are uncopyrighted and available for download from www.forestryimages.org. USDA is an equal opportunity provider and employer. Control Methods Control Methods Giant Hogweed (Heracleum mantegazzianum) A Federal Noxious Weed Giant Hogweed (Heracleum mantegazzianum) A Federal Noxious Weed

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Angelica (Angelica atropurpurea), which hasa smooth, purple stem, rarely exceeds 8 ft tall,and has round, white flowers.

Clear, watery sap in the leaves and stemscontain glucoside phototoxins. These causehypersensitivity to sunlight, resulting inblisters to skin after contact followed byexposure to sunlight.

Height: 8–15 ft when flowering.Leaves: Large, compound, deeply incised,and 3–5 ft wide. Hairs on the underside arestiff, dense, and stubby but only about0.25 mm long. Petioles have short, coarsewhite hairs at the base. Flower head:Flat topped and up to 2.5 ft across.

• Ravines, roadside ditches, and riparian areas• Residential properties and vacant lots• Wooded or open-space areas between residential communities

Direct contact with hogweed’s leaves or stemscan blister the skin. Glucoside phototoxins inthe plant’s clear, watery sap react with sunlightto cause the painful blisters.

G I A N T H O G W E E D

The preferred method of control is integrated pestmanagement (IPM). Site-specific control methods needto match local situations. Denial of seed production,with appropriatesite rehabilitation,for 4 to 5 years

usually eradicateslimited localpopulations.

HabitatHabitat MorphologyMorphology

Commonly Mistaken for...Commonly Mistaken for...

Public Health HazardPublic Health Hazard

U.S. Department of Agriculture • Animal and Plant Health Inspection ServiceProgram Aid No. 1744 June 2003

Photo credits: USDA Forest Service employee David Powell took the shot of cow parsnip.The remaining images were taken by APHIS photographers from North Carolina. All photos areuncopyrighted and available for download from www.forestryimages.org.

USDA is an equal opportunity provider and employer.

Control MethodsControl Methods

Giant Hogweed (Heracleum mantegazzianum)A Federal Noxious Weed

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